Confused between RMS (Root Mean Square) and PMPO (Peak Music Power Output) when choosing an audio amplifier? RMS measures consistent power for clear sound, while PMPO represents peak bursts for marketing allure. But what do they really mean?
Simply put, RMS measures the steady power output of an amplifier, indicating how much power it can provide consistently without distortion. This is important for enjoying clear and rich sound over time.
PMPO, on the other hand, refers to the maximum power the amplifier can deliver in short bursts, like during a musical peak. While PMPO sounds impressive, it’s not a reliable measure of an amplifier’s everyday performance.
Understanding the difference between these two terms can help you make better decisions when picking an amplifier, ensuring you get the best sound quality for your needs.
RMS (Root-Mean Square)
It is the minimum continuous sinewave power output measured in watts that can be delivered by the amplifier into a rated load, over the specified bandwidth with maximum specified total harmonic distortion.
PMPO (Peak Music Power Output)
This is the capability of an amplifier either over a short duration during which there is no perceptible sag of the power supplies during the measurement, or when very high-quality power supplies are used with normal music input.
It appears that some companies simply multiply RMS output by 8 or (2√2)2. RMS power is a more relied-upon method for comparison.
An example of a PMPO rating can often be found on the panel of a car audio amplifier. While PMPO is not a well-defined standard of measurement, it frequently appears on product packaging and amplifier panels.
Different manufacturers may use various definitions for this rating, making PMPO more of a marketing tool aimed at attracting customers who desire higher power ratings at lower costs.
How do you think understanding RMS and PMPO can influence your choices when buying audio equipment? Share your experiences and insights in the comments!
Also, don’t miss our project on A Simple Audio Amplifier With a Dual Power Source!
Unfortunately, that’s a poor example of a PMPO rating. At 12-15v with a 20A fuse, you’ll be lucky for it to peak at 300w, let alone 1000w.
i was taught, if an 2 channel amp is 1000w P.M.P.O. it would be 500w M.P.O. so 250w RMS. split over 2 channels 125w RMS per channel.
I received these 2 amps PA-80D. P.M.P.O 1000W and all that came was the top with all the jacks and knob attached to the circuit board.With a red and black wire hanging out. There is no bottom inclosure to hide the all the internal components. Is that normal and where do the red and black wires connect to?